UnitTests/Shader: Add sanitization and optimizations unit tests

tests/Engine/Shader/Sanitizations.cpp

@@ -0,0 +1,81 @@
+#include <Engine/Shader/ShaderUtils.hpp>
+#include <Nazara/Core/File.hpp>
+#include <Nazara/Core/StringExt.hpp>
+#include <Nazara/Shader/ShaderBuilder.hpp>
+#include <Nazara/Shader/ShaderLangParser.hpp>
+#include <Nazara/Shader/Ast/SanitizeVisitor.hpp>
+#include <catch2/catch.hpp>
+#include <cctype>
+
+TEST_CASE("sanitizing", "[Shader]")
+{
+	WHEN("splitting branches")
+	{
+		std::string_view nzslSource = R"(
+struct inputStruct
+{
+	value: f32
+}
+
+external
+{
+	[set(0), binding(0)] data: uniform<inputStruct>
+}
+
+[entry(frag)]
+fn main()
+{
+	let value: f32;
+	if (data.value > 3.0)
+		value = 3.0;
+	else if (data.value > 2.0)
+		value = 2.0;
+	else if (data.value > 1.0)
+		value = 1.0;
+	else
+		value = 0.0;
+}
+)";
+
+		Nz::ShaderAst::StatementPtr shader = Nz::ShaderLang::Parse(nzslSource);
+
+		Nz::ShaderAst::SanitizeVisitor::Options options;
+		options.splitMultipleBranches = true;
+
+		REQUIRE_NOTHROW(shader = Nz::ShaderAst::Sanitize(*shader, options));
+
+		ExpectNZSL(*shader, R"(
+[entry(frag)]
+fn main()
+{
+	let value: f32;
+	if (data.value > (3.000000))
+	{
+		value = 3.000000;
+	}
+	else
+	{
+		if (data.value > (2.000000))
+		{
+			value = 2.000000;
+		}
+		else
+		{
+			if (data.value > (1.000000))
+			{
+				value = 1.000000;
+			}
+			else
+			{
+				value = 0.000000;
+			}
+			
+		}
+		
+	}
+	
+}
+)");
+
+	}
+}